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An endangered species is a population of organisms which is at risk of becoming extinct because it is either few in numbers, or threatened by changing environmental or predation parameters. Also it could mean that due to deforestation there may be a lack of food and/or water. The International Union for Conservation of Nature (IUCN) has calculated the percentage of endangered species as 40 percent of all organisms based on the sample of species that have been evaluated through 2006. Many nations have laws offering protection to conservation reliant species: for example, forbidding hunting, restricting land development or creating preserves. Only a few of the many species at risk of extinction actually make it to the lists and obtain legal protection. Many more species become extinct, or potentially will become extinct, without gaining public notice.
The more general term used for species at risk of extinction is threatened species, which also includes the less-at-risk category of vulnerable species together with endangered and critically endangered.

Their categories include:-
1.Extinct Species are the last remaining member of the species has died, or is presumed beyond reasonable doubt to have died. Examples: Javan Tiger, Thylacine, Dodo, Passenger Pigeon, Caribbean Monk Seal, Dimetrodon, Aurochs, Dusky Seaside Sparrow.

2.Critically Endangered Species are the species that faces an extremely high risk of extinction in the immediate future. Examples: Huxley Panda,Mountain Gorilla, Arakan Forest Turtle, Darwin's Fox, Javan Rhino, Brazilian Merganser, Gharial, Vaquita.

3.Endangered Species are those which face a very high risk of extinction in the near future. Examples: Dhole, Blue Whale, Bonobo, Ethiopian wolf, Giant Panda, Snow Leopard, African Wild Dog, Tiger, Indian Rhinoceros, three species of Albatrosses, Crowned Solitary Eagle, Philippine Eagle, Markhor, Orangutan, Grevy's zebra, Tasmanian Devil, Harp Seal.